170 mercruiser engine troubles

[lewski]

Hi, I have a 1986 170 hp merc inboard,outboard and have a little water getting in the oil.Was wondering what would be the most likely cause since I already replaced the head gasket

 

[Bt Doctur]

Re: 170 mercruiser engine troubles

inline 4, fwc ?
water no, A/F yes
water can only come from a bad riser drowning #4 cylinder

 

[stonyloam]

Re: 170 mercruiser engine troubles

inline 4, fwc ?
water no, A/F yes
water can only come from a bad riser drowning #4 cylinder

I think that even with a bad riser it would still be antifreeze, the seawater dumps into the exhaust way aft just above the exhaust elbow. If it is just a little, and it is not antifreeze, I would suspect condensation. If it is antifreeze, you may have gotten some into the oil when you changed the head gasket, and the oil should be changed ASAP.